add filter for gmane archives

Extracted from import_slrnspool, since some spools get converted
to mbox or what not.

1 files changed, 41 insertions, 0 deletions

diff --git a/lib/PublicInbox/Filter/Gmane.pm b/lib/PublicInbox/Filter/Gmane.pm
new file mode 100644
index 00000000..f9042dfc
--- /dev/null
+++ b/lib/PublicInbox/Filter/Gmane.pm
@@ -0,0 +1,41 @@
+# Copyright (C) 2018 all contributors <meta@public-inbox.org>
+# License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
+
+# Filter for importing some archives from gmane
+package PublicInbox::Filter::Gmane;
+use base qw(PublicInbox::Filter::Base);
+use strict;
+use warnings;
+
+sub scrub {
+        my ($self, $mime) = @_;
+        my $hdr = $mime->header_obj;
+
+        # gmane rewrites Received headers, which increases spamminess
+        # Some older archives set Original-To
+        foreach my $x (qw(Received To)) {
+                my @h = $hdr->header_raw("Original-$x");
+                if (@h) {
+                        $hdr->header_set($x, @h);
+                        $hdr->header_set("Original-$x");
+                }
+        }
+
+        # Approved triggers for the SA HEADER_SPAM rule,
+        # X-From is gmane specific
+        foreach my $drop (qw(Approved X-From)) {
+                $hdr->header_set($drop);
+        }
+
+        # appears to be an old gmane bug:
+        $hdr->header_set('connect()');
+
+        $self->ACCEPT($mime);
+}
+
+sub delivery {
+        my ($self, $mime) = @_;
+        $self->scrub($mime);
+}
+
+1;